urban mushing is a riot !
I'm not sure about the harness though . (hinders shoulder movement)
Keep it clean in case you decide to return it.
The problem with this is that the piece at the front can restrict his forward motion.
have a look at some harness scooteringandsleddinggear
the power should be distributed over the back
this is a good tutorial , (former forum member) https://www.youtube.com/watch?v=jgKwEdkCOUU
help , where's the brakes again? https://www.youtube.com/watch?v=7FlVLKLlln0
I did cart dog work -- hauling home groceries, the "kid" from kindergarten , all the friends who wanted a turn .
We did a lot of parades . Great fun . Dogs loved it.
Later on I did sled dog work after buying a handcrafted sled made by a Quebec artisan when my friend a pro racer (Iditarod / Yukon Quest) moved on to a sleek , lightweight , modern version.
I include this because ground work - directionals ,your hee and your haw , around , slow, and stop are important obedience .
Before you head out you should do a warm up . Stretch the limbs out. Standing , take each forelimb and run through the full range of motion. Cupping the elbow , push limb up and into full range of extension, hold , rock, then release. Now the opposite . Same limb pushed back -- pastern and under chin , then leg down and followed through as if running .
Same for both sides.
Rear - run through full range of motion . Take back leg and fold it up and hold , rock , return to stand . Same leg cupped at "knee" now extend to as straight as it can go, rock a few times . release.
Same for the other side.
This stretching prevents injuries or sprains.
add this - good information on the proper harness http://k9trailtime.wordpress.com/page/5/